In this study, we showed that the Ca2+- and voltage dependent K+ channel KCa1.1 functions in the plasma membrane of patient-derived primary glioblastoma cells as well as the U-87 MG cell line in association with its auxiliary β3 subunit (Figs. 1, 2, 3 and 4). The gene discussed is KCNMA1; the disease is glioblastoma.